Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm51a1396s&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM51A-1396
Physics
2723 Magnetic Reconnection (7526, 7835), 2724 Magnetopause And Boundary Layers, 7827 Kinetic And Mhd Theory, 7835 Magnetic Reconnection (2723, 7526), 7836 Mhd Waves And Instabilities (2149, 2752, 6050)
Scientific paper
The generation of FTEs and magnetotail flux ropes is a natural result of the Alfvenic interaction of magnetofluids at current sheets. The impinging of fast mode wave packets may compress the magnetopause over multiple regions where the threshold condition for localized breakdown of the frozen-in condition is satisfied. The compressional fast mode wave packets convert into shear Alfven wave packets irreversibly through twisting of the magnetic field lines while conserving the magnetic helicity, giving the signature of FTEs or magnetic flux ropes. Previously, the magnetic twist of FTEs as a function of shear magnetic fields has been evaluated by employing magnetic helicity conservation (e.g., Song and Lysak, 1989; Wright and Berger, 1989) and the relationship between (i) the polarities and the amplitude of the FTEs and (ii) MLT and the direction of IMF has been given (Song and Lysak, 1994). However, these kinematic calculations do not reveal the dynamical nature of the Alfvenic interaction process including the localized non-ideality. In this presentation, we will (i) present the basic dynamical theory of the generation of parallel electric fields required by reconnection (Song and Lysak, 2006); (ii) demonstrate the dynamical generation of parallel electric fields during the conversion of fast mode wave packets into shear Alfven wave packets; and (iii) point out how the theoretical problems in the traditional reconnection models have misled and impeded our understanding of the dynamical processes occurring at current sheets that are associated with the breakdown of the frozen-in condition.
Lysak Robert L.
Song Yushu
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